公开(公告)号：US20240337777A1

公开(公告)日：2024-10-10

申请号：US18748104

申请日：2024-06-20

Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY

Inventor： Zhiyuan LI ,  Haoran MO ,  Zitao JI ,  Yidong ZHENG

IPC: G02B3/12 ,  G02B1/11 ,  H01L27/146

CPC classification number: G02B3/12 ,  G02B1/11 ,  H01L27/14627

Abstract: A micro-lens based on a high-refractive-index dielectric substrate, comprising a light-transmitting dielectric substrate. The dielectric substrate has an incident surface for incident light to be incident on, and a wavelength λ of incident light ranges from 2.5 μm-25 μm. The dielectric substrate has an emergent surface and a plano-concave air cavity, and the plano-concave air cavity is formed in the dielectric substrate. One end of the plano-concave air cavity is a planar end facing the incident surface, and the other end is a spherical end having a notch shape and the notch facing the emergent surface, so that the incident light is focused into a focus after passing through the plano-concave air cavity, and thus the full width at half maximum of field intensity at the focus is smaller than the full width at half maximum defined by a Rayleigh diffraction limit formula.